US11693171B2ActiveUtilityA1
Display device
Est. expiryOct 22, 2041(~15.3 yrs left)· nominal 20-yr term from priority
G02B 6/0068G02B 6/0038G02B 6/0076G02B 6/0013
93
PatentIndex Score
2
Cited by
3
References
14
Claims
Abstract
According to one embodiment, a display device includes a display panel, a first light guide, and a second light guide. In the first light guide, a first main surface includes a first plane and first grooves between the first plane and a first side surface, a second main surface includes second grooves orthogonal to the first grooves, and a second plane between the second grooves and the first side surface. In the second light guide, a third main surface includes a third plane and third grooves located between the third plane and a fourth side surface, a fourth main surface includes fourth grooves orthogonal to the third grooves, and a fourth plane located between the fourth grooves and the fourth side surface.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A display device comprising:
a display panel configured to display an image;
a first light guide having a first main surface opposed to the display panel, a second main surface on a side opposite to the first main surface, a first side surface, and a second side surface on a side opposite to the first side surface;
a second light guide having a third main surface opposed to the second main surface, a fourth main surface on a side opposite to the third main surface, a third side surface close to the first side surface, and a fourth side surface located on a side opposite to the third side surface and close to the second side surface;
a plurality of first light sources opposed to the first side surface; and
a plurality of second light sources opposed to the fourth side surface, wherein
the first main surface includes a first plane and a plurality of first grooves located between the first plane and the first side surface,
the second main surface includes a plurality of second grooves opposed to the first plane and orthogonal to the first grooves, and a second plane located between the second grooves and the first side surface,
the third main surface includes a third plane and a plurality of third grooves located between the third plane and the fourth side surface and parallel to the first grooves, and
the fourth main surface includes a plurality of fourth grooves opposed to the third plane and orthogonal to the third grooves, and a fourth plane located between the fourth grooves and the fourth side surface.
2. The display device of claim 1 , wherein
the first side surface and the second side surface are opposed to each other in a first direction, and
the plurality of first grooves extend in the first direction and are arranged in a second direction orthogonal to the first direction.
3. The display device of claim 1 , wherein
the plurality of first grooves are opposed to the second plane and are not opposed to the plurality of second grooves, and
the plurality of third grooves are opposed to the fourth plane and are not opposed to the plurality of fourth grooves.
4. The display device of claim 3 , wherein
a boundary between the first plane and one of the first grooves overlaps a boundary between the second plane and one of the second grooves, and
a boundary between the third plane and one of the third grooves overlaps a boundary between the fourth plane and one of the fourth grooves.
5. The display device of claim 3 , wherein
the first main surface includes a fifth plane located between the plurality of first grooves and the first side surface and opposed to the second plane, and
the third main surface includes a sixth plane located between the plurality of third grooves and the fourth side surface and opposed to the fourth plane.
6. The display device of claim 5 , wherein
the plurality of first grooves and the plurality of third grooves extend in a first direction,
a length of the first grooves along the first direction is smaller than a length of the fifth plane along the first direction, and
a length of the third grooves along the first direction is smaller than a length of the sixth plane along the first direction.
7. The display device of claim 1 , wherein
at least part of the plurality of first grooves are opposed to the plurality of second grooves, and
at least part of the plurality of third grooves are opposed to the plurality of fourth grooves.
8. The display device of claim 7 , wherein
the first main surface includes a fifth plane located between the plurality of first grooves and the first side surface and opposed to the second plane, and
the third main surface includes a sixth plane located between the plurality of third grooves and the fourth side surface and opposed to the fourth plane.
9. The display device of claim 8 , wherein
a boundary between the fifth plane and one of the first grooves overlaps a boundary between the second plane and one of the second grooves, and
a boundary between the sixth plane and one of the third grooves overlaps a boundary between the fourth plane and one of the fourth grooves.
10. The display device of claim 8 , wherein
a boundary between the fifth plane and one of the first grooves is opposed to the second plane, and
a boundary between the sixth plane and one of the third grooves is opposed to the fourth plane.
11. The display device of claim 8 , wherein
the plurality of first grooves and the plurality of third grooves extend in a first direction,
a length of the first grooves along the first direction is smaller than a length of the fifth plane along the first direction, and
a length of the third grooves along the first direction is smaller than a length of the sixth plane along the first direction.
12. The display device of claim 1 , wherein
each of the first grooves and the third grooves is formed between two adjacent protruding portions, and
the protruding portions have curved surfaces.
13. The display device of claim 1 , wherein
the plurality of first light sources and the plurality of second light sources are laser sources.
14. The display device of claim 12 , wherein
a length of the first grooves along a first direction is formed according to the following equation (1)
L
11
=
tan
26.5
°
tan
δ
L
0
d
(
1
)
L 11 : length of the first grooves along the first direction,
δ: angle of incidence of light on the first light guide,
26.5°: angle of incidence at which light is made incident on the first light guide at a small loss, and
d: thickness of the first light guide, and
a contact angle of the protruding portion is formed according to the following equation (2)
θ
=
arc
sin
(
sin
2
θ
0
tan
26.5
°
tan
δ
)
2
(
2
)
θ: contact angle of the protruding portion, and
Lo≥2 mm and θo≥2°.Cited by (0)
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